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Previously, RenderPass::Replace...Color() was taking a reference
to the quad's rectangle, then replacing the quad.  Unfortunately,
that destroys the original rect before it can be re-used a few
lines later.

This CL just makes a copy of the rect instead.

BUG=751746

Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Ice4a5e147000813a1e19c60ba33de5f36b2b11d7
Reviewed-on: https://chromium-review.googlesource.com/598489
Commit-Queue: Frank Liberato <liberato@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491764}